This undated photo provided by the Cleveland Metroparks Zoo shows a male silverback gorilla named Mokolo in the Primate, Cat & Aquatics sections of the Cleveland Metroparks Zoo in Cleveland. Cleveland Metroparks Zoo received a female gorilla named Fredrika from Florida's Zoo Miami and a female gorilla named Kebi Moya from the Columbus Zoo and Aquarium in Powell, Ohio, selected to join Mokolo, in the hope of creating a new troop. (Kyle Lanzer/Cleveland Metroparks Zoo via AP)

This undated photo provided by the Cleveland Metroparks shows a female gorilla named Kebi Moya. Cleveland Metroparks Zoo received a female gorilla named Fredrika from Florida's Zoo Miami and Kebi Moya, from the Columbus Zoo and Aquarium in Powell, Ohio, selected to join the Cleveland zoo's male silverback gorilla named Mokolo in the hope of creating a new troop. (Grahm S. Jones/Columbus Zoo and Aquarium/Cleveland Metroparks Zoo via AP)

This undated photo provided by the Cleveland Metroparks Zoo shows a female gorilla named Fredrika. Cleveland Metroparks Zoo received Fredrika from Florida's Zoo Miami and a female gorilla named Kebi Moya from the Columbus Zoo and Aquarium in Powell, Ohio, selected to join the Cleveland zoo's male silverback gorilla named Mokolo in the hope of creating a new troop. (Zoo Miami/Cleveland Metroparks Zoo via AP)